Improvement in sights for fire-arms



W. .LYMAN Sight for Fire-Arms.

No. 211,753. lPafented Jan. 28,1879.I

MPETERS, FHOT0 L THOGRAPNER WASHINGTON D c UNITED STATES PATENT OEEIGE.

WILLIAM LYMAN, OF MIDDLEFIELD,CONNECTIOUT.`

IMPROVEMENT IN SIGHTS FOR FIRE-ARMS.

Specification forming part of Letters Patent No. 211,753, dated January28, 1879 application lcd December 16, 1878.

To all whom it may concern:

Be it known that I, WILLIAM LYMAN, of Middleeld, in the county ot'Middlesex and State of Connecticut, have invented a new Improvement inSights for Fire-Arms; and I do hereby declare the following, when takenin connection with the accompanying drawings andthe letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure 1, side view; Fig. 2, vertical central section, enlarged; Fig. 3,transverse section, enlarged; Fig. 4, crosssection on line x of Fig. 2;Fig. 5, collar for adjusting` the opening of the sight.

This invention relates to an improvement in the rear sight for hre-arms,the object being simple construction and accurate adjustment; and itconsists in the construction, as hereinafter described, and moreparticularly recited in the claims.

A is the base or plate by which the sight is attached to the arm, and isof common construction; B, the hinge for the sight, which is arrangedbetween ears C' C on the base in the usual manner, and through the earsand hinge a setscrew, l), is also arranged in the usual manner to bindthe ears C C upon the hinge and hold the sight, whenever desirable. E isthe usual spring beneath the base, which falls into a notch in the hingewhen the sight is turned up for use.

The hingc part B extends above and over the ears, as seen in Fig. 3, andou this part is a stationary tube, a, with a vertical slot, d, in oneside, as seen in Fig. 4. Over this tube is placed a sleeve, c,screw-threaded upon its inside and constructed with an annular flange,

, f, at its lower end, and onto this ange is set a collar, h, bothsitting into a recess in the extension of the part B, and then the upperedge, a, otl this extension is turned inward over the collar, so as tosecure the sleeve upon the inner tube, and so as to allow the sleeve tobe freely revolved, butto prevent lon gitudinal movement. F is thesight, which is preferably in form of a disk with an eye-opening, m.From this a shank, r, extends downward, and so as to tit closely intothe inner tube, a and on this shank r is a projecting rib, s,corresponding to the slot d in the inner tube, and so as to projectthrough the said slot and engage with the inner screw-thread of thesleeve e, and so that by turning the sleeve e either to the rightor leftthe sight will be raised or lowered accordingly.

The shank of the sight is graduated to indicate different points ofelevation; and to enable a micrometer adjustment the llange f may bealso graduated to indicate certain portions of revolution, and therebyfractionally divide the graduations on the shank.

Toadj ust the opening in the sight a recess, t, is made on the side, oflarger diameter than the actual opening m. Fitted to this are severaldisks, fw, with openings smaller than the openings m, the said diskseach tting the recess t, and so that either one may be introducedaccordingly as the opening is required to be reduced or enlarged.

I claim- 1. The combination ofthe slotted tubehin ged to the base, theinternally screw-threaded sleeve arranged to revolve freely on said tubewithout vertical movement, the sight constructed with a shank ttin gsaid tube, with a projection through the slot to engage the thread ofthesleeve, substantially as described.

2. The combination of the tube hinged to the base, theinternally-threaded sleeve arranged upon said tube, constructed with anannular iiange at its lower end, projections from hinge part closed oversaid iiange, and the sight constructed with a shank to move verticallyin said tube and engage with the said sleeve, substantially asdescribed.

'l WILLIAM LYMAN.

Witnesses LYMAN A. MILLS, WM. P. RICHARDSON.

